Re: [manifest] Ability to define platform-specific icon/splash style (#361)

Should there be an option for icon processing? Many OSes perform icon processing to massage them into the system's look and feel:

* iOS 1-6 had the `-precomposed` flag to opt-out of icons getting rounded and glossed
* All iOS versions will fill in transparency with black
* Android still rounds off very sharp corners. Some versions, especially older ones, will also shrink the icon and apply a drop shadow.
* [Firefox OS always applies a drop shadow](https://www.mozilla.org/en-US/styleguide/products/firefox-os/icons/)

Some sort of `precomposed` parameter to opt out of this processing would be good for designers who want to do these sorts of operations themselves for maximum visual control.

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https://github.com/w3c/manifest/issues/361#issuecomment-147900678